Easiest way to increase the General hardness (GH
) is by adding some Seachem Equilibrium. It contains calcium and magnesium sulphates. Calcium and magnesium are the major ions associated with GH
and sulphates will not increase the pH. You will also get a touch of iron, manganese and some extra potassium.
If you add compounds that contain carbonates or bicarbonates you raise the carbonate hardness (KH
) and this is what will increase the pH.